18.
Adjusting
the
Position
of
the
Buttonhole
in
Relation
to
the
Cutting
Space
The position of the buttonhole in relation to the cutting space is adjusted
as
follows:
The
zero
line of the needle
bar
vibration lies on the right, i.e. the needlef
vibrates
from
right to
left
olways.
When the amount of needle vibration is reduced to zero by turning screw J
out, i.e. when the needle
does
not
vibrate
at
all, the needle
penetrates
either parallel of the buttonhole on its right.
The knife must cut the slash exactly in the middle of the buttonhole.
In
case
the cut is
somewhat
off
center,
first check
whether
the
needle
or
the knife is bent. If not, the position of the parollels must be corrected.
This
is done by means of screw N and N, on lever M (Photo
22).
By
turning
the lower screw N inwardly, the right parallel is moved to the left; by
turning it outwardly, to the right. Turning inwardly the upper screw N, wili
move the left parallel to the left; turning it outwardly, to the right.
19.
Regulating
fhe
Distance
Between
Parallels
(Photo
22)
As follows from the preceding section, the distance between the parallels
of the buttonhole can be regulated by means of screws N and N,. After
the regulation tighten the nuts of both screws x securely.
The distance
between
the poralleis must not be
too
wide
as
this would
result
in
an
ugly
appearance of the buttonhole after
cutting
open.
20.
Exchanging
the
Buttonhole
Knife
When
inserting
a new
buttonhole
knife,
loosen
screw b
(Photo
17)
end
push
the knife up in the knife holder as far as it
will
go.
When
cutting
the fabric, the
knife
should
descend far
enough
so that its
lowest point (front edge) is .04" below the needle plate. If the knife is
worn by grinding, it must be
set
lower accordingly.
26
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